linux-kernel - [PATCH 1/4] cgroup: fix incorrect destination cgroup in cgroup_update_dfl

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Date:	Thu,  3 Mar 2016 12:19:59 -0500
From:	Tejun Heo <tj@...nel.org>
To:	lizefan@...wei.com, hannes@...xchg.org
Cc:	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-team@...com, Tejun Heo <tj@...nel.org>
Subject: [PATCH 1/4] cgroup: fix incorrect destination cgroup in cgroup_update_dfl_csses()

cgroup_update_dfl_csses() should move each task in the subtree to
self; however, it was incorrectly calling cgroup_migrate_add_src()
with the root of the subtree as @dst_cgrp.  Fortunately,
cgroup_migrate_add_src() currently uses @dst_cgrp only to determine
the hierarchy and the bug doesn't cause any actual breakages.  Fix it.

Signed-off-by: Tejun Heo <tj@...nel.org>
---
 kernel/cgroup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index c63fce0..50879aa 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2901,7 +2901,7 @@ static int cgroup_update_dfl_csses(struct cgroup *cgrp)
 		struct cgrp_cset_link *link;
 
 		list_for_each_entry(link, &dsct->cset_links, cset_link)
-			cgroup_migrate_add_src(link->cset, cgrp,
+			cgroup_migrate_add_src(link->cset, dsct,
 					       &preloaded_csets);
 	}
 	spin_unlock_bh(&css_set_lock);
-- 
2.5.0